[erlang-questions] extending the scanner and parser

[H.Li]

> 
> The way these tools get the extra information is by making a copy of
> erl_scan and erl_parse and modifying them to suit their purposes.
> This is a big maintenance headache and it limits interoperability
> between these tools, but currently the only way to solve the problem.

That's exactly what Wrangler does. It would be really great if the standard
scanner could be extended to support extra information. 

Regards,
Huiqing